What Is Checking NVRAM?
The message checking NVRAM, NVRAM checksum or NVRAM test may appear when your PC first boots up. This message tells you that the PC is looking through its RAM or memory storage. When there is a checking NVRAM error, it may be that the computer memory has been corrupted or the computer's hardware is faulty.
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NVRAM
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NVRAM stands for non-volatile random access memory. It is also called non-volatile memory and non-volatile storage or NVS. NVRAM is a type of static random access memory which is saved when the computer loses power or it is suddenly turned off during a power outage.
SRAM
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Static random access memory or SRAM is a type of computer memory that is retained as long as there is electrical power being fed to it. Static RAM is not periodically refreshed as dynamic RAM or DRAM is, but it does access data faster than DRAM. SRAM is a PC's cache memory and is one part of the RAM digital-to-analog converter located on a computer's video card.
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EEPROM
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The computer is able to save memory by using a backup battery to power it, or by saving the contents on NVRAM or an electrically erasable programmable ROM or EEPROM. EEPROM is user-modifiable read only memory or ROM that can be erased and reprogrammed or written on with the help of a high electrical voltage. EEPROM can be erased and reprogrammed up to 100,000 times before it is no longer usable.
How it Works
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When there is a power outage the static RAM is saved onto the NVRAM. When power returns and you turn the computer back on, the NVRAM is accessed and the saved information is returned to the static RAM. This allows the computer to make fast saves of changing bits of memory that occurs during use, such as when you are typing into a Word file.
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References
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